1. Improve the accuracy of fan assembly

選用低噪聲的傳動(dòng)裝置，采用合適的葉輪形狀和降低葉輪轉(zhuǎn)速均可減少運(yùn)轉(zhuǎn)時(shí)噪聲，特別是大容量燃?xì)怆姴膳癄t，安裝時(shí)沒有緩沖墊運(yùn)行時(shí)產(chǎn)生的機(jī)械噪聲及由于風(fēng)機(jī)裝配精度不高、機(jī)組運(yùn)轉(zhuǎn)時(shí)不平衡的產(chǎn)生的沖擊噪聲與磨擦噪聲高強(qiáng)度地從進(jìn)氣口、排氣口、管道、調(diào)節(jié)閥、機(jī)殼以及傳動(dòng)機(jī)械等各部位輻射出來，引發(fā)高頻尖叫聲。

Low noise transmission device, proper impeller shape and low impeller speed can reduce the noise during operation, especially for large capacity gas-fired electric heating furnace, the mechanical noise generated during operation without cushion during installation, and the impact noise and friction noise generated due to the low assembly accuracy of fan and unbalanced operation of the unit can be transmitted from the air inlet, exhaust port, pipeline, etc The control valve, casing, transmission machinery and other parts radiate out, causing high-frequency screams.

2、改變噴嘴形狀減少噪聲的產(chǎn)生

2. Changing nozzle shape to reduce noise

燃?xì)鈴膰娮旄咚偕淞鞒鰜?，與四周靜止的空氣之間產(chǎn)生強(qiáng)烈的擾動(dòng)與動(dòng)量、質(zhì)量交換而形成噪聲。試驗(yàn)得知，合理設(shè)計(jì)噴射口距離，防止射流相互干擾使射流起始段的特性發(fā)生變化，可以有效減少燃燒噪聲。設(shè)應(yīng)采用多孔噴嘴，降低燃?xì)獾膲毫蛧娮斓某隹诹魉?，不僅可減少射流噪聲，而且還可降低燃燒噪聲。

When the gas comes out of the nozzle at high speed, there is a strong disturbance and momentum and mass exchange between the gas and the static air around, resulting in noise. The results show that the combustion noise can be effectively reduced by reasonably designing the distance between the nozzles and preventing the mutual interference of the jets. In order to reduce not only jet noise but also combustion noise, multi hole nozzle should be used to reduce gas pressure and nozzle outlet velocity.

3、噴嘴設(shè)計(jì)加工合理

3. Reasonable nozzle design and processing

噴嘴流出的燃?xì)庀蛳鄬?duì)靜止的氣體中擴(kuò)散時(shí)，氣流方向和流束截面突然變化，會(huì)引起很大的噪聲。噴嘴有毛刺或孔口粗糙不圓時(shí)，氣流經(jīng)噴嘴收縮便產(chǎn)生偏位噪聲。燃?xì)鈮毫υ礁?，偏位噪聲越大。所以，設(shè)噴嘴的徑長(zhǎng)比一般取1∽2、噴嘴收縮角取60度方為合適，加工時(shí)保證加工精度及光潔度，將可大大減少產(chǎn)生噪聲。

When the gas from the nozzle diffuses into the relatively static gas, the sudden change of the flow direction and beam cross section will cause a lot of noise. When the nozzle has burr or the orifice is rough and not round, the air flow shrinks through the nozzle and produces deviation noise. The higher the gas pressure is, the greater the deviation noise is. Therefore, when designing the nozzle, the ratio of diameter to length is generally taken as 1 ∽ 2, and the nozzle contraction angle is taken as 60 degrees. When machining, the machining accuracy and smoothness can be ensured, and the noise can be greatly reduced.

4、合理設(shè)計(jì)配氣管

4. Rational design of air distribution pipe

從燃?xì)獗壤刂崎y出口到噴嘴前的氣路應(yīng)園角過渡，保證氣流通暢，不會(huì)引起燃?xì)獗壤刂崎y內(nèi)的平衡組件振動(dòng)，引發(fā)氣流擾動(dòng)從而產(chǎn)生噪聲。另外，燃?xì)獗壤刂崎y上蓋的阻尼孔是用來調(diào)節(jié)空氣量，除了保證閥門起到降壓和穩(wěn)壓作用外，還起到降低和控制噪聲傳播的作用，因此在使用過程中不能受堵塞。

The gas path from the outlet of the gas proportional control valve to the front of the nozzle should have a circular angle transition to ensure the smooth flow of the gas, and will not cause the vibration of the balance components in the gas proportional control valve, which will cause the disturbance of the gas flow and produce noise. In addition, the damping hole on the upper cover of the gas proportional control valve is used to adjust the air volume, which can not only ensure the valve to reduce pressure and stabilize pressure, but also reduce and control the noise transmission, so it can not be blocked in the process of use.

5、引射器設(shè)計(jì)裝配合理

5. Reasonable design and assembly of ejector

引射器工作時(shí)，如果混合管粗糙或有毛刺，氣流通過時(shí)將產(chǎn)生噪聲。另外，裝配噴嘴時(shí)，其出口截面到引射器的喉部應(yīng)有一定的距離且噴嘴線與混合管線應(yīng)一致，否則將導(dǎo)致偏移或交角過大，這樣不利于一次空氣的吸入也會(huì)產(chǎn)生噪聲。

When the ejector works, if the mixing tube is rough or has burr, the noise will be produced when the air flows through. In addition, when assembling the nozzle, there should be a certain distance between the outlet section and the throat of the ejector, and the center line of the nozzle and the mixing pipe should be consistent, otherwise it will lead to deviation or too large intersection angle, which is not conducive to the primary air suction and will also produce noise.

綜合而言，電采暖爐產(chǎn)生噪音一般是由于前期系統(tǒng)設(shè)計(jì)不合理，造成電采暖爐出現(xiàn)噪音等問題，而一般高質(zhì)量的電采暖爐都是經(jīng)過多次的運(yùn)轉(zhuǎn)測(cè)試，各個(gè)零部件安裝都是經(jīng)過人員檢測(cè)合格的，一般不存在硬件安裝問題。

Generally speaking, the noise of electric heating furnace is generally caused by the unreasonable system design in the early stage, resulting in the noise and other problems of electric heating furnace. Generally speaking, the high-quality electric heating furnace has been tested for many times, and the installation of each part has been qualified by professional personnel, so there is generally no hardware installation problem.